/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Collision/CollisionConstraintFlags.h
Remove an ignore entry for collisions of Particle0->Particle1 (in both directions if applicable)
void RemoveIgnoreCollisions ( [FGeometryParticleHandle](API\Runtime\Chaos\Chaos\FGeometryParticleHandle) * Particle0, [FGeometryParticleHandle](API\Runtime\Chaos\Chaos\FGeometryParticleHandle) * Particle1 )